In a bright room, a group of middle-aged people who looked to be in their thirties or forties were sitting together.

The sitting postures of these people are very standard. Of course, relatively speaking, compared with the free and loose postures of ordinary people, their sitting postures are already very disciplined.

In front of them was a middle-aged man in his forties, wearing a full summer military uniform, but missing his military rank.

There were a hundred blackboards placed next to him, with some patterns drawn on them and some

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